2687609 has 2 divisors, whose sum is σ = 2687610. Its totient is φ = 2687608.

The previous prime is 2687603. The next prime is 2687611. The reversal of 2687609 is 9067862.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1960000 + 727609 = 1400^2 + 853^2 .

It is a cyclic number.

It is not a de Polignac number, because 2687609 - 2⁴ = 2687593 is a prime.

It is a Sophie Germain prime.

Together with 2687611, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (2687603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1343804 + 1343805.

It is an arithmetic number, because the mean of its divisors is an integer number (1343805).

2^2687609 is an apocalyptic number.

It is an amenable number.

2687609 is a deficient number, since it is larger than the sum of its proper divisors (1).

2687609 is an equidigital number, since it uses as much as digits as its factorization.

2687609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36288, while the sum is 38.

The square root of 2687609 is about 1639.3928754268. The cubic root of 2687609 is about 139.0343237700.

The spelling of 2687609 in words is "two million, six hundred eighty-seven thousand, six hundred nine".